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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Some time ago I suggested to integrate [1][2] ReactOS with QubesOS to run Windows programs in secure domains - it's problematic to do properly with the real Windows.
[1] https://github.com/QubesOS/qubes-issues/issues/2809
[2] https://jira.reactos.org/browse/CORE-13358
sys-net, sys-firewall and other administrative vms should slowly migrate to unikernels instead of running linux, which should help with ram usage. The mirage.io project seems to build a couple qubes vms, for example https://github.com/mirage/qubes-mirage-firewall is a firewall which they indicate to give 64Mb of ram.